The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 12, 1980
Filed:
Nov. 02, 1978
Applicant:
Inventors:
Shoichi Otsuka, Hachioji, JP;
Takashi Fukui, Chiba, JP;
Assignee:
Horikiri Spring Manufacturing Co., Ltd., Yachiyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21B / ;
U.S. Cl.
CPC ...
72366 ; 29173 ; 72240 ;
Abstract
A method of forming a taper leaf for use in a laminated spring wherein pre-tapering work is first performed by which a terminal portion of a sheet of spring material is transformed in its lateral direction so as to become thinner toward the tip while maintaining the vertical thickness of the sheet or section at the original thickness of the material. Subsequently, the same portion is rolled for tapering in a vertical direction.